@pixi/core/lib/shader/ShaderSystem.mjs

import { ExtensionType, extensions } from '@pixi/extensions';
import './utils/index.mjs';
import { generateProgram } from './utils/generateProgram.mjs';
import { generateUniformBufferSync } from './utils/generateUniformBufferSync.mjs';
import { unsafeEvalSupported } from './utils/unsafeEvalSupported.mjs';
import { generateUniformsSync } from './utils/generateUniformsSync.mjs';

let UID = 0;
const defaultSyncData = { textureCount: 0, uboCount: 0 };
class ShaderSystem {
  constructor(renderer) {
    this.destroyed = false;
    this.renderer = renderer;
    this.systemCheck();
    this.gl = null;
    this.shader = null;
    this.program = null;
    this.cache = {};
    this._uboCache = {};
    this.id = UID++;
  }
  systemCheck() {
    if (!unsafeEvalSupported()) {
      throw new Error("Current environment does not allow unsafe-eval, please use @pixi/unsafe-eval module to enable support.");
    }
  }
  contextChange(gl) {
    this.gl = gl;
    this.reset();
  }
  bind(shader, dontSync) {
    shader.disposeRunner.add(this);
    shader.uniforms.globals = this.renderer.globalUniforms;
    const program = shader.program;
    const glProgram = program.glPrograms[this.renderer.CONTEXT_UID] || this.generateProgram(shader);
    this.shader = shader;
    if (this.program !== program) {
      this.program = program;
      this.gl.useProgram(glProgram.program);
    }
    if (!dontSync) {
      defaultSyncData.textureCount = 0;
      defaultSyncData.uboCount = 0;
      this.syncUniformGroup(shader.uniformGroup, defaultSyncData);
    }
    return glProgram;
  }
  setUniforms(uniforms) {
    const shader = this.shader.program;
    const glProgram = shader.glPrograms[this.renderer.CONTEXT_UID];
    shader.syncUniforms(glProgram.uniformData, uniforms, this.renderer);
  }
  syncUniformGroup(group, syncData) {
    const glProgram = this.getGlProgram();
    if (!group.static || group.dirtyId !== glProgram.uniformDirtyGroups[group.id]) {
      glProgram.uniformDirtyGroups[group.id] = group.dirtyId;
      this.syncUniforms(group, glProgram, syncData);
    }
  }
  syncUniforms(group, glProgram, syncData) {
    const syncFunc = group.syncUniforms[this.shader.program.id] || this.createSyncGroups(group);
    syncFunc(glProgram.uniformData, group.uniforms, this.renderer, syncData);
  }
  createSyncGroups(group) {
    const id = this.getSignature(group, this.shader.program.uniformData, "u");
    if (!this.cache[id]) {
      this.cache[id] = generateUniformsSync(group, this.shader.program.uniformData);
    }
    group.syncUniforms[this.shader.program.id] = this.cache[id];
    return group.syncUniforms[this.shader.program.id];
  }
  syncUniformBufferGroup(group, name) {
    const glProgram = this.getGlProgram();
    if (!group.static || group.dirtyId !== 0 || !glProgram.uniformGroups[group.id]) {
      group.dirtyId = 0;
      const syncFunc = glProgram.uniformGroups[group.id] || this.createSyncBufferGroup(group, glProgram, name);
      group.buffer.update();
      syncFunc(glProgram.uniformData, group.uniforms, this.renderer, defaultSyncData, group.buffer);
    }
    this.renderer.buffer.bindBufferBase(group.buffer, glProgram.uniformBufferBindings[name]);
  }
  createSyncBufferGroup(group, glProgram, name) {
    const { gl } = this.renderer;
    this.renderer.buffer.bind(group.buffer);
    const uniformBlockIndex = this.gl.getUniformBlockIndex(glProgram.program, name);
    glProgram.uniformBufferBindings[name] = this.shader.uniformBindCount;
    gl.uniformBlockBinding(glProgram.program, uniformBlockIndex, this.shader.uniformBindCount);
    this.shader.uniformBindCount++;
    const id = this.getSignature(group, this.shader.program.uniformData, "ubo");
    let uboData = this._uboCache[id];
    if (!uboData) {
      uboData = this._uboCache[id] = generateUniformBufferSync(group, this.shader.program.uniformData);
    }
    if (group.autoManage) {
      const data = new Float32Array(uboData.size / 4);
      group.buffer.update(data);
    }
    glProgram.uniformGroups[group.id] = uboData.syncFunc;
    return glProgram.uniformGroups[group.id];
  }
  getSignature(group, uniformData, preFix) {
    const uniforms = group.uniforms;
    const strings = [`${preFix}-`];
    for (const i in uniforms) {
      strings.push(i);
      if (uniformData[i]) {
        strings.push(uniformData[i].type);
      }
    }
    return strings.join("-");
  }
  getGlProgram() {
    if (this.shader) {
      return this.shader.program.glPrograms[this.renderer.CONTEXT_UID];
    }
    return null;
  }
  generateProgram(shader) {
    const gl = this.gl;
    const program = shader.program;
    const glProgram = generateProgram(gl, program);
    program.glPrograms[this.renderer.CONTEXT_UID] = glProgram;
    return glProgram;
  }
  reset() {
    this.program = null;
    this.shader = null;
  }
  disposeShader(shader) {
    if (this.shader === shader) {
      this.shader = null;
    }
  }
  destroy() {
    this.renderer = null;
    this.destroyed = true;
  }
}
ShaderSystem.extension = {
  type: ExtensionType.RendererSystem,
  name: "shader"
};
extensions.add(ShaderSystem);

export { ShaderSystem };
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